DYNISCO PG500 Series
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2.7
Alarm Relay Ratings
The alarm relay is rated at 5 amperes at 115 VAC, 230 VAC and 30
VDC. Relay rating is 0.6 amperes at 110 VDC.
2.8
Power Supply Requirements
The PG500 Series pressure gauge operates on 12 VDC +/- 5% with a
typical current draw of 25 mA for the non-alarm version and 60 mA
for the alarm model (50 and 100 mA maximum). Any 12 VDC supply
meeting the requirements may be used.
3.
OPERATION
3.1
Zero Adjustment (all models)
After wiring and mounting have been completed, calibration of the
instrument will be necessary. (Ideally this will be done with the
extruder barrel heated to normal operating temperature). With the
gauge under zero load, zero the unit using the zero adjust screw
located on the front panel. Turn the screw counter-clockwise until the
off scale indicator illuminates, then clockwise slowly until this indication
ceases. The unit will now be calibrated.
3.2
Alarm Adjustment (PG551-PG552)
Units equipped with an alarm are adjusted via the front panel using
the alarm set screw. Rotation of this screw controls the relay contact
closure setpoint. The visual yellow bar graph indicates the setpoint
position. Relay will trigger when pressure exceeds alarm setpoint.
Units designated with the prefix TPG contain an integral
thermocouple. To remove the thermocouple, loosen the set screw on
the side of the probe as shown in Figure 11. Without twisting, pull the
thermocouple probe stem carefully out of the probe.
To install the thermocouple, align the slot on the probe stem with the
pressure capillary tube and press into the probe until the
thermocouple shoulders against the probe. Lock the thermocouple in
place by tightening the set screw.
3.3
Thermocouple Removal & Installation (TPG543 & TPG553)
